Wikipedia's info on "Pre-sectarian Buddhism"

[thomaslaw]

What language the Buddha speaks is unknow. But, the Buddha in Vinaya, Cullavagga (Vin. II, PTS, p. 139 ), advises bhikkhus to use your own language (sakāya niruttiyā) for his teachings.

Who teaches according to the EBTs in the US?

In Vinaya, Cullavagga, the Buddha advises bhikkhus not to use Vedic language (Chanda; i.e. Vedic Sanskrit) (Vin. II, PTS, p. 139 “Chandaso”) for the Buddha’s language/teachings (buddhavacana), but use your own language (sakāya niruttiyā) for the Buddha’s teachings. If making the Vedic language for the Buddha’s teachings, it will be corrupt. The essential teaching here is “sakāya niruttiyā” (based on your own language) for the Buddha’s teachings “Buddhavacana”. No any languages, including Pali,…

"Pāli ain't a Prakrit" ~ Ollett

Pali, literally ‘text’, a Prakrit, is based on a dialect (one of Middle Indo-Aryan dialects) from the region of Ujjeni (Ujjayani), capital of Avanti, in western India, according to Japanese scholars (p. 6, note 16): Page 6 from The Fundamental Teachings of Early Buddhism Choong Mun-keat 2000.pdf (107.4 KB)